I think that at point a it has the most KE. Why I think that is because it is above the ground level. At point C the roller coaster it at it's loweest opint so it has the most KE. When the roller coaster is at it's slowest point that means were it's speed decreases. At point D is when you ahv ethe highest GPE becasue it is were the roller coaster's height is rising. If you were ever to go onto a roller coaster in your life, you will see that when you are at the highest oint of the roller coastar also known as the climax. That is when you have the most GPE. When you are at the very bottom of the roller coaster is when you will have the most KE. The next itme that you are ona roller coaster. Check to see were there is athe most GPE and KE on a roller coaster.
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